diff --git a/Pantograph/Environment.lean b/Pantograph/Environment.lean
index ad21284..c9f9fec 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 searchPath ← searchPathRef.get
+      let sourceUri? ← module?.bindM (Server.documentUriFromModule searchPath ·)
+      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..67a37df 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 +175,10 @@ structure EnvInspectResult where
   inductInfo?:      Option InductInfo      := .none
   constructorInfo?: Option ConstructorInfo := .none
   recursorInfo?:    Option RecursorInfo    := .none
+
+  sourceUri?: Option String := .none
+  sourceStart?: Option Lean.Position := .none
+  sourceEnd?: Option Lean.Position := .none
   deriving Lean.ToJson
 
 structure EnvAdd where