Added docstring

1a91bec6 · Reinout van Rees · 52ac25dc · 1a91bec6
Commit 1a91bec6 authored Nov 13, 2015 by Reinout van Rees
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src/zc/buildout/easy_install.py src/zc/buildout/easy_install.py +1 -0

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--- a/src/zc/buildout/easy_install.py
+++ b/src/zc/buildout/easy_install.py
@@ -608,6 +608,7 @@ class Installer:
    def _constrain(self, requirement):
+        """Return requirement with optional [versions] constraint added."""
        constraint = self._versions.get(requirement.project_name.lower())
        if constraint:
            requirement = _constrained_requirement(constraint, requirement)