diff --git a/powercap.hpp b/powercap.hpp
index b28be8c..17c468f 100644
--- a/powercap.hpp
+++ b/powercap.hpp
@@ -4,6 +4,7 @@
 
 #include "occ_status.hpp"
 
+#include <filesystem>
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/bus/match.hpp>
 
@@ -96,6 +97,18 @@
      */
     void writeOcc(uint32_t pcapValue);
 
+    /**
+     * @brief Returns the filename to use for the user power cap
+     *
+     * The file is of the form "powerX_cap_user", where X is any
+     * number.
+     *
+     * @param[in] path - The directory to look for the file in
+     *
+     * @return std::string - The filename, or empty string if not found.
+     */
+    std::string getPcapFilename(const std::filesystem::path& path);
+
     /** @brief Reference to sdbus **/
     sdbusplus::bus::bus& bus;