Update manual.

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@@ -3520,6 +3520,8 @@ Some modes may be unavailable in some circumstances (missing or outdated source
 
 This is pretty much the source file view window, but with the ability to select one of the source files that the compiler used to build the symbol. Additionally, each source file line that produced machine code in the symbol will show a count of associated assembly instructions, displayed with an '\texttt{@}' prefix, and will be marked with grey color on the scroll bar. Due to how optimizing compilers work, some lines may seemingly not produce any machine code, for example, because iterating a loop counter index might have been reduced to advancing a data pointer. Some other lines may have a disproportionate amount of associated instructions, e.g., when the compiler applied a loop unrolling optimization. This varies from case to case and from compiler to compiler.
 
+The \emph{Propagate inlines} option, available when sample data is present, will enable propagation of the instruction costs down the local call stack. For example, suppose a base function in the symbol issues a call to an inlined function (which may not be readily visible due to being contained in another source file). In that case, any cost attributed to the inlined function will be visible in the base function. Because the cost information is added to all the entries in the local call stacks, it is possible to see seemingly nonsense total cost values when this feature is enabled. To quickly toggle this on or off, you may also press the \keys{X} key.
+
 \paragraph{Assembly mode}
 
 This mode shows the disassembly of the symbol machine code. If only one inline function is selected through the \emph{\faSitemap{}~Function} selector, assembly instructions outside of this function will be dimmed out. Each assembly instruction is displayed listed with its location in the program memory during execution. If the \emph{\faSearchLocation{}~Relative locations} option is selected, the profiler will print an offset from the symbol beginning instead. Clicking the \LMB{}~left mouse button on the address/offset will switch to counting line numbers, using the selected one as the origin (i.e., zero value). Line numbers are displayed inside \texttt{[]} brackets. This display mode can be useful to correlate lines with the output of external tools, such as \texttt{llvm-mca}. To disable line numbering click the \RMB{}~right mouse button on a line number.