diff --git a/packages/safe-chain/src/shell-integration/supported-shells/bash.js b/packages/safe-chain/src/shell-integration/supported-shells/bash.js
index bcf0bc6..3491bc7 100644
--- a/packages/safe-chain/src/shell-integration/supported-shells/bash.js
+++ b/packages/safe-chain/src/shell-integration/supported-shells/bash.js
@@ -35,7 +35,7 @@ function teardown(tools) {
     );
   }
 
-  // Removes the line that sources the safe-chain bash initialization script (any path, requires safe-chain comment)
+  // Marker comment ensures only safe-chain-added lines are removed, not user's own source statements
   removeLinesMatchingPattern(
     startupFile,
     /^source\s+.*init-posix\.sh.*#\s*Safe-chain/,
diff --git a/packages/safe-chain/src/shell-integration/supported-shells/windowsPowershell.js b/packages/safe-chain/src/shell-integration/supported-shells/windowsPowershell.js
index e3ed236..041cca7 100644
--- a/packages/safe-chain/src/shell-integration/supported-shells/windowsPowershell.js
+++ b/packages/safe-chain/src/shell-integration/supported-shells/windowsPowershell.js
@@ -33,7 +33,7 @@ function teardown(tools) {
     );
   }
 
-  // Remove the line that sources the safe-chain PowerShell initialization script (any path, requires safe-chain comment)
+  // Match any installation path but require the Safe-chain marker to avoid removing unrelated user scripts
   removeLinesMatchingPattern(
     startupFile,
     /^\.\s+["']?.*init-pwsh\.ps1["']?.*#\s*Safe-chain/,
diff --git a/packages/safe-chain/src/shell-integration/supported-shells/zsh.js b/packages/safe-chain/src/shell-integration/supported-shells/zsh.js
index b2c29e4..c9be67f 100644
--- a/packages/safe-chain/src/shell-integration/supported-shells/zsh.js
+++ b/packages/safe-chain/src/shell-integration/supported-shells/zsh.js
@@ -34,7 +34,7 @@ function teardown(tools) {
     );
   }
 
-  // Removes the line that sources the safe-chain zsh initialization script (any path, requires safe-chain comment)
+  // Remove init script source line to uninstall shell integration; marker ensures only safe-chain-added lines are removed
   removeLinesMatchingPattern(
     startupFile,
     /^source\s+.*init-posix\.sh.*#\s*Safe-chain/,