diff --git a/src/pipgrip/cli.py b/src/pipgrip/cli.py
index fd37e98..35a1059 100755
--- a/src/pipgrip/cli.py
+++ b/src/pipgrip/cli.py
@@ -409,6 +409,8 @@ def main(
     if no_cache_dir:
         cache_dir = tempfile.mkdtemp()
 
+    logger.debug('----------[PackageSource]---')
+
     try:
         source = PackageSource(
             cache_dir=cache_dir,
@@ -419,6 +421,8 @@ def main(
         for root_dependency in dependencies:
             source.root_dep(root_dependency)
 
+        logger.debug('----------[VersionSolver]---')
+
         solver = VersionSolver(source)
         try:
             solution = solver.solve()
@@ -428,6 +432,8 @@ def main(
             solution = solver.solution
             exc = e
 
+        logger.debug('----------[decision_packages]---')
+
         decision_packages = OrderedDict()
         for package, version in solution.decisions.items():
             if package == Package.root():
@@ -436,6 +442,8 @@ def main(
 
         logger.debug("decision_packages: {}".format(decision_packages))
 
+        logger.debug('----------[build_tree]---')
+
         tree_root, packages_tree_dict, packages_flat = build_tree(
             source, decision_packages
         )