Add some comments, if for nothing else, then for educational purposes

bin/tmuxifier

@@ -21,16 +21,20 @@ abs_dirname() {
 }
 
 if [ -z "${TMUXIFIER}" ]; then
+  # Set TMUXIFIER relative to the "tmuxifier" executable.
   export TMUXIFIER="$(dirname "$(abs_dirname "$0")")"
 else
+  # Strip any trailing slash (/) characters from TMUXIFIER variable.
   export TMUXIFIER="${TMUXIFIER%/}"
 fi
 
 # Load tmuxifier environment variables.
 source "$TMUXIFIER/lib/env.sh"
 
+# Add tmuxifier's internal commands to PATH.
 export PATH="$TMUXIFIER/libexec:$PATH"
 
+# Check Tmux version.
 export TMUXIFIER_MIN_TMUX_VERSION="1.6"
 if [ "$(tmuxifier-tmux-version "$TMUXIFIER_MIN_TMUX_VERSION")" == "<" ]; then
   echo -e "ERROR: Tmuxifier requires Tmux v${TMUXIFIER_MIN_TMUX_VERSION}" \
@@ -38,6 +42,7 @@ if [ "$(tmuxifier-tmux-version "$TMUXIFIER_MIN_TMUX_VERSION")" == "<" ]; then
   exit 1
 fi
 
+# Parse given command
 command="$1"
 case "$command" in
   "" | "-h" | "--help" )