diff --git a/Pantograph/Environment.lean b/Pantograph/Environment.lean
index ad21284..c48414a 100644
--- a/Pantograph/Environment.lean
+++ b/Pantograph/Environment.lean
@@ -58,7 +58,7 @@ def inspect (args: Protocol.EnvInspect) (options: @&Protocol.Options): CoreM (Pr
     | none => return .error $ Protocol.errorIndex s!"Symbol not found {args.name}"
     | some info => pure info
   let module? := env.getModuleIdxFor? name >>=
-    (λ idx => env.allImportedModuleNames.get? idx.toNat) |>.map toString
+    (λ idx => env.allImportedModuleNames.get? idx.toNat)
   let value? := match args.value?, info with
     | .some true, _ => info.value?
     | .some false, _ => .none
@@ -80,7 +80,7 @@ def inspect (args: Protocol.EnvInspect) (options: @&Protocol.Options): CoreM (Pr
       then value?.map (λ e =>
         e.getUsedConstants.filter (!isNameInternal ·) |>.map (λ n => serializeName n) )
       else .none,
-    module? := module?
+    module? := module?.map (·.toString)
   }
   let result ← match info with
     | .inductInfo induct => pure { core with inductInfo? := .some {
@@ -113,6 +113,20 @@ def inspect (args: Protocol.EnvInspect) (options: @&Protocol.Options): CoreM (Pr
           k := r.k,
       } }
     | _ => pure core
+  let result ← if args.source?.getD false then
+      let srcSearchPath ← initSrcSearchPath
+      let sourceUri? ← module?.bindM (Server.documentUriFromModule srcSearchPath ·)
+      let declRange? ← findDeclarationRanges? name
+      let sourceStart? := declRange?.map (·.range.pos)
+      let sourceEnd? := declRange?.map (·.range.endPos)
+      .pure {
+        result with
+        sourceUri?,
+        sourceStart?,
+        sourceEnd?,
+      }
+    else
+      .pure result
   return .ok result
 def addDecl (args: Protocol.EnvAdd): CoreM (Protocol.CR Protocol.EnvAddResult) := do
   let env ← Lean.MonadEnv.getEnv
diff --git a/Pantograph/Protocol.lean b/Pantograph/Protocol.lean
index 90ac149..a8abb3d 100644
--- a/Pantograph/Protocol.lean
+++ b/Pantograph/Protocol.lean
@@ -5,6 +5,7 @@ Note that no command other than `InteractionError` may have `error` as one of
 its field names to avoid confusion with error messages generated by the REPL.
 -/
 import Lean.Data.Json
+import Lean.Data.Position
 
 namespace Pantograph.Protocol
 
@@ -121,11 +122,13 @@ structure EnvCatalogResult where
 -- Print the type of a symbol
 structure EnvInspect where
   name: String
-  -- If true/false, show/hide the value expressions; By default definitions
-  -- values are shown and theorem values are hidden.
+  -- Show the value expressions; By default definitions values are shown and
+  -- theorem values are hidden.
   value?: Option Bool := .some false
-  -- If true, show the type and value dependencies
+  -- Show the type and value dependencies
   dependency?: Option Bool := .some false
+  -- Show source location
+  source?: Option Bool := .some false
   deriving Lean.FromJson
 -- See `InductiveVal`
 structure InductInfo where
@@ -172,6 +175,11 @@ structure EnvInspectResult where
   inductInfo?:      Option InductInfo      := .none
   constructorInfo?: Option ConstructorInfo := .none
   recursorInfo?:    Option RecursorInfo    := .none
+
+  -- Location in source
+  sourceUri?: Option String := .none
+  sourceStart?: Option Lean.Position := .none
+  sourceEnd?: Option Lean.Position := .none
   deriving Lean.ToJson
 
 structure EnvAdd where
diff --git a/Test/Common.lean b/Test/Common.lean
index 53adaa0..3cad256 100644
--- a/Test/Common.lean
+++ b/Test/Common.lean
@@ -143,6 +143,8 @@ def runTest (t: TestT m Unit): m LSpec.TestSeq :=
   Prod.snd <$> t.run LSpec.TestSeq.done
 def runTestWithResult { α } (t: TestT m α): m (α × LSpec.TestSeq) :=
   t.run LSpec.TestSeq.done
+def runTestCoreM (env: Environment) (coreM: TestT CoreM Unit) (options: Array String := #[]): IO LSpec.TestSeq := do
+  runCoreMSeq env (runTest coreM) options
 
 end Monadic
 
diff --git a/Test/Environment.lean b/Test/Environment.lean
index 79d04ed..a9f6cdc 100644
--- a/Test/Environment.lean
+++ b/Test/Environment.lean
@@ -97,11 +97,26 @@ def test_inspect: IO LSpec.TestSeq := do
     ) LSpec.TestSeq.done
   runCoreMSeq env inner
 
+def test_symbol_location : TestT IO Unit := do
+  let env: Environment ← importModules
+    (imports := #[`Init])
+    (opts := {})
+    (trustLevel := 1)
+  addTest $ ← runTestCoreM env do
+    let .ok result ← Environment.inspect { name := "Nat.le_of_succ_le", source? := .some true } (options := {}) | fail "Inspect failed"
+    checkEq "module" result.module? <| .some "Init.Data.Nat.Basic"
+
+    -- Doesn't work for symbols in `Init` for some reason
+    --checkEq "file" result.sourceUri? <| .some "??"
+    checkEq "pos" result.sourceStart? <| .some { line := 344, column := 0 }
+    checkEq "pos" result.sourceEnd? <| .some { line := 344, column := 88 }
+
 def suite: List (String × IO LSpec.TestSeq) :=
   [
     ("Catalog", test_catalog),
     ("Symbol Visibility", test_symbol_visibility),
     ("Inspect", test_inspect),
+    ("Symbol Location", runTest test_symbol_location),
   ]
 
 end Pantograph.Test.Environment