diff --git a/init.sh b/init.sh
index 0669c31..059fec5 100644
--- a/init.sh
+++ b/init.sh
@@ -1,4 +1,4 @@
-# Set tmuxifier root path.
+# Set/fix Tmuxifier root path if needed.
 if [ -z "${TMUXIFIER}" ]; then
   export TMUXIFIER="${HOME}/.tmuxifier"
 else
@@ -11,7 +11,7 @@ if [[ ":$PATH:" != *":$TMUXIFIER/bin:"* ]]; then
 fi
 
 # If `tmuxifier` is available, and `$TMUXIFIER_NO_COMPLETE` is not set, then
-# load tmuxifier shell completion.
+# load Tmuxifier shell completion.
 if [ -n "$(command -v "tmuxifier")" ] && [ -z "$TMUXIFIER_NO_COMPLETE" ]; then
   if [ -n "$BASH_VERSION" ]; then
     source "$TMUXIFIER/completion/tmuxifier.bash"
diff --git a/init.tcsh b/init.tcsh
index a681394..c17dd49 100644
--- a/init.tcsh
+++ b/init.tcsh
@@ -1,13 +1,15 @@
-# Set tmuxifier root path.
+# Set Tmuxifier root path if needed.
 if ( ! $?TMUXIFIER ) then
   setenv TMUXIFIER "${HOME}/.tmuxifier"
 endif
 
-# Add `bin` directroy to `$PATH`.
-set path = ( $TMUXIFIER/bin $path )
+# Add `bin` directroy to `$path` if needed.
+if ( " $path " =~ "* $TMUXIFIER/bin *" ) then
+  set path = ( $TMUXIFIER/bin $path )
+endif
 
 # If `tmuxifier` is available, and `$TMUXIFIER_NO_COMPLETE` is not set, then
-# load tmuxifier shell completion.
+# load Tmuxifier shell completion.
 if ( ! $?TMUXIFIER_NO_COMPLETE ) then
   which tmuxifier > /dev/null && source "$TMUXIFIER/completion/tmuxifier.tcsh"
 endif