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Garnett, Killip, and Schul have exhibited a doubling measure $\mu$ withsupport equal to $\mathbb{R}^{d}$ which is $1$-rectifiable, meaning there arecountably many curves $\Gamma_{i}$ of finite length for which$\mu(\mathbb{R}^{d}\backslash \bigcup \Gamma_{i})=0$. In this note, wecharacterize when a doubling measure $\mu$ with support equal to a connectedmetric space $X$ has a $1$-rectifiable subset of positive measure and show thisset coincides up to a set of $\mu$-measure zero with the set of $x\in X$ forwhich $\liminf_{r\rightarrow 0} \mu(B_{X}(x,r))/r>0$.

A characterization of $1$-rectifiable doubling measures with connected supports